AEMCA Practice Exam

If a person has type B blood, which antibody will they produce?

1. Anti-B antibodies

2. None

3. A antibodies

4. Rh antibodies

The correct answer is: A antibodies

A person with type B blood naturally produces antibodies against type A blood, known as anti-A antibodies. This immune response is due to the presence of B antigens on the surface of their red blood cells, which is why they must produce antibodies against any A antigens they may encounter in transfusions or during pregnancy. In this context, since the individual has type B blood, it is pivotal to understand that A antibodies are produced as a biological defense mechanism against incompatible blood types, while there are no anti-B antibodies created by type B individuals themselves. Rh antibodies would come into play if the individual was Rh-negative and was exposed to Rh-positive blood, but this is a separate consideration. The choice indicating that the person produces A antibodies directly reflects their immune system's adaptation to prevent potential complications and maintain compatibility with blood transfusions or organ transplants. Therefore, this aligns with the biological understanding of blood group compatibility.